Self-tailers have plastic parts that don't like UV.
There may be increased grease wash-out, but I doubt it is important with good water proof grease. I've never seen that, even with several years of neglect.
So, rain is good, sun is bad? Certainly the material should not be water proof.
All of the points are good ones and I would like to hear more.
(when asked how he reached the starting holds on a difficult rock climbing problem that clearly favored taller climbers - he was perhaps 5'5")
"Well, I just climb up to them."
by Joe Brown, English rock climber
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